initial commit

third_party/eigen/bench/benchmarkX.cpp

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+// g++ -fopenmp -I .. -O3 -DNDEBUG -finline-limit=1000 benchmarkX.cpp -o b && time ./b
+
+#include <iostream>
+
+#include <Eigen/Core>
+
+using namespace std;
+using namespace Eigen;
+
+#ifndef MATTYPE
+#define MATTYPE MatrixXLd
+#endif
+
+#ifndef MATSIZE
+#define MATSIZE 400
+#endif
+
+#ifndef REPEAT
+#define REPEAT 100
+#endif
+
+int main(int argc, char *argv[]) {
+  MATTYPE I = MATTYPE::Ones(MATSIZE, MATSIZE);
+  MATTYPE m(MATSIZE, MATSIZE);
+  for (int i = 0; i < MATSIZE; i++)
+    for (int j = 0; j < MATSIZE; j++) {
+      m(i, j) = (i + j + 1) / (MATSIZE * MATSIZE);
+    }
+  for (int a = 0; a < REPEAT; a++) {
+    m = I + 0.0001 * (m + m * m);
+  }
+  cout << m(0, 0) << endl;
+  return 0;
+}